What is the abundance of beryllium-10 ?

Q: You have discovered a new element - Bluehenium (Bl).  It has two naturally occurring isotopes 68Bl…

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Q: How are electrons and protons similar? How are they different?

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Q: 4. What are the main ideas in the nuclear theory of the atom?

A: The main ideas of nuclear theory of an atom has to be given. The atomic model of Rutherford is also…

Q: Aluminum has 13 electrons, 13 protons and 14 neutrons a) What is its atomic mass? b) What is its…

A: The atomic number of aluminium is = 13 The number of protons in the aluminium is = 13 The number of…

Q: Where on the periodic table are metalloids found?

A: ANSWER

Q: What atoms are in period 4, group 6A? What atom is in period 2, group 6A?

A: The periodic table is a tabular display of the chemical elements which are arranged by atomic…

Q: How many electrons are in an atom of Te?

A: Tellurium is a 'p' - block element in which the differentiating e- enters into a p - orbital of the…

Q: 1. A sample of magnesium has the following isotopic abundances: Isotopic mass (amu) 23.99 24.99…

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Q: Explain the Nuclear Model of the Atom?

A: Rutherford's atomic model is also known as the nuclear model of an atom.

Q: Two isotopes of rubidium occur naturally, Rb-85 at 72.17% (84.91 amu) and Rb-87 at 27.83% (86.91…

A: Given, two isotopes of rubidium as follows,Rb-85 at 72.17% (84.91 amu) and Rb-87 at 27.83% (86.91…

Q: Calculate the average atomic mass of silver. The percentages denote the relative abundances. Isotope…

A: Given data,Relative abundance of 109Ag=48.16%Relative abundance of 107Ag=51.84%Atomic mass of…

Q: Question attached

A: Ans: Rb-85 = 72.17% = 0.7217 * 84.91 amu = 61.2795 Rb-87 = 27.83% = 0.2783 * 86.91 amu = 24.1871

Q: 1. A carbon atom with 7 neutrons, and a positive charge. 2. A nitrogen atom with 7 neutrons, 8…

A: Given We know about the number of protone ,nutron  and charge

Q: An unknown element has two naturally occurring isotopes. Isotope 1 has a mass of 119.0 amu and an…

A: Average mass of an element is defined as the atomic mass of the element calculated by multiplying…

Q: The relative atomic mass of antimony is 121,8. Antimony exists as two isotopes - antimony 121 and…

A: Given, The relative atomic mass of antimony is 121.8 and it's two isotopes  antimony 121 and…

Q: What is the atomic number of the transition metal Gold (Au)?

A: Atomic number of gold is  79

Q: Explain the Properties of Protons ?

A: The properties of protons has to be explained.

Q: Explain the role of atomic number in determining the identity of an atom.

A: Atomic number(Z) is may be defined as the number of protons present in a neutral(uncharged) atom,…

Q: Rutherford's gold foil experiment contributed to the discovery that: A. Atoms contain electrons B.…

A: The given statements about Rutherford's gold foil experiment are : A. Atoms contain electronsB.…

Q: What is the relative charge of an electron and proton?

A: ANSWERE IS DISCUSSED BELOW :

Q: What is the atomic number of element X? 56% O a) 25

A: Atomic number  is  also called as proton number  of a chemical element  and it is defined as  number…

Q: What is the most massive part of an atom? A. Protons B. Nucleus C. Area outside the nucleus D.…

A: We know that an atom contains three subatomic particles - electrons , protons and neutrons.…

Q: 4. What is the atomic number? (a) 14 (b) 7 (c) 4 (d) 10

A: The atomic number indicates the number of protons in the nucleus. The number of protons define the…

Q: (a) How many protons are found in one atom of selenium-80? protons (b) How many neutrons are found…

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Q: What fundamental force is responsible for holding together the subatomic particles of an atomic…

A: There are various physical forces acting all around us. Four fundamental forces are listed below:…

Q: A neutral atom with an atomic number of five has how many electrons? (A) 1 (B) 5 (C) None (D)…

A: Given that, Neutral atom having atomic no. =5

Q: Why did J.J. Thompson experiments with cathode ray tubes imply about the mass of an electron…

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Q: what group in the periodic table would an element with atomic number 112 belong?

A: • We need to determine the group in the periodic table would an element with atomic number 112…

Q: Atoms with the same number of protons but with different electrical charges _____.

A: Electric Charge is two types.    Positive charge Cation and negative charge anions

Q: 24.1% of all isotopes of an element have a mass of 75.23 amu. 48.7% have a mass of 74.61 amu and…

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Q: 4.40 Two isotopes of rubidium occur naturally, Rb and Rb. Which isotope of rubidium is more…

A: Average atomic mass of Rb = 85.47 Let percentage abundance of 85Rb = x and percentage abundance of…

Q: An element 'A' contains 4 protons, 4 electrons and 5 neutrons. it is + . It becomes when it has 4…

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Q: Was Democritus’s proposal of the existence of atoms based on scientific methods or ideas? Explain

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Q: One isotope has an atomic weight of 408.5 atm and a percent abundance of 23.0% while the other…

A: To calculate the atomic weight of the element, multiple the percent abundance with respective weight…

Q: The nucleus of an atom accounts for most of the size and mass of the atom. O very little of the size…

A: According to Dalton's atomic theory, compound is formed by combining elements and it's also based on…

Q: Neon has three stable nautrally occurring isotopes. The isotopic mass and percent abundance of these…

A: The average atomic mass of neon is determined using the below formula.

Q: element 'X' is

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Q: Explain how Dalton’s atomic theory accounts for the law of conservation of mass?

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Q: Which pair correctly matches an element to its atomic number? O a) 9.012 - Be O b) 12.01 - C c)…

A: The atomic number of an element is equal to the total number of protons in the nucleus of the…

Q: 17.A hypothetical element X is found to have an atomic mass of 37.45 amu. Element X has 2 isotopes,…

A: Given that mass of X-37 = 37.24   Let x be the mass of the other isotope  Fractional abundance of…

Q: While looking at bromine (Br) on the periodic table, a student needs to find another element with…

A: The

Q: Atomic Mass Number of Number of Number of Element Symbol number number protons electrons neutrons…

A: The number of protons, neutrons and electrons which make up a neutral atom has to be given. A…

Q: An element 'A' contains 4 protons, 4 electrons and 5 neutrons. it is It becomes • when it has 4…

A: The question is based on the concept of atomic structure. by looking at proton,  neutron &…

Q: mass е relative (amu) abundance 111.9 90.3% 118.9 9.7%

A: Average Atomic mass = = (M1X1 + M2X2)/(X1+X2) = (111.9×90.3 + 118.9×9.7)/100 = 112.579 amu = 113

Q: Which of the following statements regarding atomic Br and Cl is FALSE?

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Q: Do isotopes have the same chemistry among each other? Do they have the same electron configuration?

A: Isotopes of an element have same number of protons with different number of neutrons in the nucleus.…

Q: An element 'A' contains 4 protons, 4 electrons and 5 neutrons. it is •. It becomes • when it has 4…

A: